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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26592a44cb0f31de4de2f079fa222a1f2f9947ce7d45b130184c6850e2f13171' 
  AND token = 'U+Y8EuQbd4UkmCojJht9bbN9FjmDohruymX6TFu6MdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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