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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6067dae0c3ef4d2f958689419b1afa1049bebceb70b4e5aa8f8f79d4d2a33feb' 
  AND token = 'W5MUUg3mqWvA25QdrniD/XgmMb7dYPFPtqnSbBiQoWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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