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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de9ca927033af8b90db68464aa21a78da974dd371e1d6a5eca980ac8511c4d6' 
  AND token = 'm+UT/iXQz0u00IkReenE1feoyxRVwLSaZzKA+RyrtVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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