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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9006ff6b7eefb6ddc8d284834d9dd3f6f0ed1013dd998c20486aa39bbf9fac27' 
  AND token = 'A3iXXDNFvTdMMdxL92tK2OfrbCclv9OF5IVnyv78Dio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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