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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb52bd882aaa1c56b9705c12be26f120a3e315890c7fa95b7b2cc93648249c6b' 
  AND token = '/1MlPlXTZCW1aK2i9iyESbmxHLXVtSmTCLKM1pd+OW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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