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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ed0fca9b9cf216b23c608808c34cfd388396a55efdc69e8f5e5030f19c87ea' 
  AND token = 'RWFBBUk3UQJ8pw/vHSTQOnkNZ9VIzsebsTJikEX/5Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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