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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e01d9a36b32a782416d4b93ac17b4fab7f810fe0d6112b08329ae5449a6d00e' 
  AND token = 'mpiRrT9Fk0lJWbxiaLqC2ylGuR9fW4NAhezRFfPl20A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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