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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b543062eb2f61e7cca6b3f3d09f963961a19c52767dd53b173655f31633c805b' 
  AND token = 'p8/N0R7oKvwDm9Hl9zN3gnZeUMvyCfArmeva+oH5izE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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