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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab06f1aa7ee8657c064a91f27d99f29207728e784f2a3295f796fc29a69f6f9' 
  AND token = 'MGhDfkSxvx6GIqDMpN+qcnnwjMTNbHAUg/HdqrSr3+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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