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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27978407881f7340803c8d8d06e9abc173487759715e4a474f0c259f85c5e2d8' 
  AND token = 'UevtRtEfkzyc30kzYHAPKv/ctol1wcydnW+sye5yA6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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