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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4a93e6d6f60dccd4c1669afdede3570d0fef181cd3b3fd2d126eafc1092b6b1' 
  AND token = 'g/2fTUtY3FL35YexXOxq1YT3qOt74O+LAw+Xzsd3wYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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