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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3483e7cd8f57c58cb9f90dd98eccba6c20f3bfc1b3548db72f2b68e9f46dd348' 
  AND token = 'BXAzr9YJ4xPmAs+U7u9eQf8+0yr10+iAXWKrtAF9Lkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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