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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afa3f5eb8f11f48c4e5fb72f4b226a8bfa23c1b55325534d1cde0479f680d17a' 
  AND token = 'qh30tNtb/V6qWs5o9jPiKi89qqX0f5pNZ+ci2KGaZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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