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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe8d85a6bd7465799d38a62e8abce6a171ac72eaa93c5fc1ede8775a51afe70' 
  AND token = 'IUq4u4dQ0BhW8rB43Q/D5mSk8LGD27tuwfmuJBmUkJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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