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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29f1b99b9da56684b4696615aa175ec1f7107d07e28ba6b7a9da9374de7bcdc2' 
  AND token = 'i9c2tlbzF2cSUq0KqYsoZK8ftxICqBtybE2P9Uu5R5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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