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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e78b824724b33d0026fb1e822cb3326288623dd4ea5c9bfa64fe0ed7e1ecaf4' 
  AND token = 'MlgNHeZzccr3x5x9Mge2nB49UPLppuqBc1rhki9qIHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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