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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6c1e796cfdce910b8acce4c3d40ac00fa335d7e462ccaca46a4f67df31085ba' 
  AND token = 'iA3EgL3xl5tn+VcrRHqlcAkqY2ScU3v5Ep4tBrJi8jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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