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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8429850c15b9181c7e30f5a86b4cd7aed1b7fc28ed16b693db958076f774771e' 
  AND token = 'A4+PumahyM4VdqIce680W+saUtTWKFa58XvsUnz8pJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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