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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5099f59ba6c1c2df2192af0812f98ce3293c79a2e7ba26e45280d8381498f6e' 
  AND token = 'XhcVEjaEeRSyhVbq5WD0klZfi8wLWUcLCk0KocqqS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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