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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '671c5fd3b539cbbee388ca8ce64e0ac18c193ec2f340a3cfd0a80be5e9b026f1' 
  AND token = 'nAZ36JmFeUGoiMaBhuTKFHF+UZrEX2BfT0J0+12qmR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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