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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e0463dab5afe45247673d032d0800cf6b8d27adbdde482d0dd927e620194cd0' 
  AND token = 'cSbp6WQZtgGNn923lhwQjyjKJvQCZMeofj9EQpQbyfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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