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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0854805983382a2422a407fdc460de10e2f7590e8f299f9f0727af6bcb5bf7a' 
  AND token = 'w5ahw9rtZggfs7tocMxWMcIt/dI0onLG3xGMGBPZ4U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}