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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af7fa1b04ddfb0abbc6f8d85087365c0df79e797d05662e1b5d1268330265f4b' 
  AND token = '7SMDmrrBlc5K5TmHCIKthYFAhAaCJiEc9oaiaeqU0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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