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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6638cbe56fc3203eded9efffa1ff80f132755541243daf94cee22a13fd945396' 
  AND token = 'Y8kh6q7qBTNwL9dToxof/JAxKyfweQG4ScZChqo3lGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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