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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '239a6491c4182308182520abd403299b29c7075477cd72adab39870db9b3e6de' 
  AND token = 'OWJDighGorcztT8WU1DfXEskZTa5ZakaQlxvE9BtDWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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