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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9cb82c65c540b7fc2a58abcdc42af5e8d5b12cd0a1940b5dd0155ddfba4e2ae' 
  AND token = 'PneLutelU5o4hM90pye/KM9Q+VUop3SC13cvCFZbXOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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