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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3772ee62dc7b849477d1c81eb9aef16ee5753c6e3b53103fa4bd5a5f827dd968' 
  AND token = 'sY+mHm0RBJBuoGK2++Alf7MmvW7mPZf05MEsdSDn9W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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