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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3b5e4225d5e9a4b187b51da8cd19a82493001c06776f616f7abeb83d1ce6f98' 
  AND token = '1fxnuBGn/4EaNtQ1aV9Fv6mxSW0unhS+gr1gdAp6wvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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