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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9ab8aa3ea3a2dca7cee4272b224ff5bcf3aaea8c251f4a00af6d3657fad8ba' 
  AND token = 'nO33v0z/8ZeajcuVAiuW6brrlblvjS4ZJ5Z6/SxRPTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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