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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '497b913fe8098ed3c28dbda434c8d460d68cbc2004d98f8f2f086b6944916a16' 
  AND token = 'AsI3SLeLIuNnwYDedoYJgPj+0nqN+4guH1SClD47J5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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