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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5cb1cf76380fb9f4710dc64903dc637b971d20ae8e7b08e42ea75ea8315090e' 
  AND token = 'LDCDqDVgQ+fSCf+6Pde1cgulYTrzBCf82V8pm0xTQ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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