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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df20e54bb3d6bb95677161cb5e6ff829fdf2b800c0d6e5bc2558678e76a9332c' 
  AND token = 'IgVwGRF5OiNDHEXkpW1uMQVPDGBdb8n00v1wQz1ci+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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