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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28a33315c2ed22724017ede4424d1b7853bea7d62f5fa64a1ed459c10b5b8b13' 
  AND token = 'wUEvGsPR5t9mtJx086bN3rtFYGiswjj8fnDqbD8X21I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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