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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e531e16909f701064a48c1e7813d514836524ad63eaeb588000d78256f59bbd' 
  AND token = 'ftb70Mucvr6SgH6k2z/qB1s4RbK5Hzy4eIwHRPtqzBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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