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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '194e10ed4fa67f66bcfac025e0f30f8d41797d41fc0b79bc9bdc85cacec3bfaa' 
  AND token = 'ZHbtn4jFS6CjJnRihPGGEEvuYpQS5OVQfDpoGhhsl6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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