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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0060e43ba3d5d5286b09a6fd56e066e0d000e1a3dcff777668fb59db42b7f46' 
  AND token = 'hfVg3zYpylJX2GzxTXdKoZN6JS30seldVA5gGAgpEIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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