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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96851b6b143cbae7506edef8fa658142a6cf07aaab223b5b41d8eb2fb4795737' 
  AND token = '4ULRYOAngUm8VglzYUaa8z5ppye98NcjUpDJdnewXWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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