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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1b974526b1de45d5a56272618b9855b32a3822d77cf1f11d1c74ff52b3232b5' 
  AND token = 'rMV0qeFkhvq2LzmigPN9B5N47CW9QOKMLE5QiROWL5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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