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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71c5af32574629f94d4422853502e7ccf879f8f3c14f2c3db9a5f218f1c3ebde' 
  AND token = 'dcCWOKVQoEAk56NOmd1nJwa8TaFIy2n2ewlSac9CkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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