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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a040b240a10895f247798ab1b24c61bd1e3960dd1225cf75d4eab5ef6e8e35d' 
  AND token = 'xRp3doGAeWn1y6UHDED79isvjdUzV/91D+S7A0J4MUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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