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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64f0c5d3470a574f90097df48025c4d50e5dd989c9aa15952ba61dec25fb4106' 
  AND token = 'Bkm/2QP5y33hPFk+M/WtRvaXLnVi33xkodJeDRG94T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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