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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62b4dacc189ef35a8bc6dfe5a1c290668a8b35dad29a01f66f57bb87a3ae0329' 
  AND token = '23f6/z3rnrl5pjjPMiN20gkuREOw8QUlzzy9NU6oOcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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