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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b793c15474b387fc267d9a7385eaba3bd7e43e7fc2ffa0dad853f0fcc70d8b3e' 
  AND token = 'mZbvVfyfsgniBJ8f29MWL3a4P0Lk7h0ri/i/94chBoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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