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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b70beade4a04e0b6d06b644394e6eb85b78c25e2a74c73db0c05ead258b7d2d' 
  AND token = 'E65zWerd1zExLaJGR2gFY3NPa4APCkWG/7L4ydljnzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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