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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '231c5a56ccf1bdca010868c5cd8c53d0e5eed6b983e09f9c13839216b9c9372e' 
  AND token = 'VWMVqi81iDGEK5P3xFYPurn/iZSa6SDNOLEtAeYuWHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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