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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19650e6d31faa507131fc601bc81ed7599ab5836a1fd375dad9d4968d711ec88' 
  AND token = '0EZivDDSVBjyoKhVrRvVmAusJ9GLPnjTHO4h7bO7oBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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