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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd2fa6e8d355f834c580683dd63fed8eee0f64deebe1a5fee52c9963cee915e0' 
  AND token = 'KhhPvfqPKL6p0tveqT7YF/SSq1O2FAA8845WENWdKFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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