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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b72841de232026872daebf80ce77248a11b1e991e4124f38774dec5d4271cdb9' 
  AND token = 'puaQs0NPkWt9M0ORgm5vClrzl/zy7GgnF4qZQqPazKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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