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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9d2e4e7e9dc17c3bc9ea5be34ba5daa838d0bedbc06c6a08f5b3f13bd6814b6' 
  AND token = 'MQhxeewuAQdALZJ+ixrO5G2Yv3oVUmzwiwtsKmiC7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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