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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69e62cc71145edb8179276b783163a2c3b0882d914d40b0e5404a9e0e8f6756e' 
  AND token = '4T8cwXKawyNOMUtbaUNzuBCO8Sl6thhYyHcuW9ejFYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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