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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53e5e454331ae29e88b55179df27dcaefeeb8f69e98c708858b0b82f01c13ced' 
  AND token = 'bZmSzNju1wvbi7/8TxZqCDjQfGoyLkkbnreZLsePG8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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