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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50e31a919ad3ea9befd10d434fea071f411ac97668bbdecd59c8014385943b6' 
  AND token = '8AFfrgJ65c+6vKI+z0/2KbkcuwQuAqCX1E8TxaJPtcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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