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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5181dbca2abfbe96cfc15cc2a740317c08213d70f562c3e6241b99e1891d8b7' 
  AND token = 'IFnkichxpylAtm8pxPOVmklVD6NBiU0A+DYqL6gMqyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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