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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f2fbf3d68bd29d691e5c1a41989b46968bc96271d10dcecd0cb7b279621ae4' 
  AND token = 'E4X2ZxdLFu2MSxxeZVUZx2ZqdmGTHvL3BWzJE0c+qag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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